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Matching Issue ........... I think!
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January 31st 07, 07:36 PM posted to rec.radio.amateur.antenna
Jim Kelley
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First recorded activity by RadioBanter: Jul 2006
Posts: 666
Matching Issue ........... I think!
wrote:
I recently built a modified vertical dipole
from wire and using a pole and trees as supports.
I had hoped it would work on 2 bands 75 and 40 but it only
works on one 75 where the VSWR is 1.3:1 and the bandwidth is 85 khz
for the 2:1 points.
On 40 meters the VSWR is over 10:1 so I thought I could use a 1/4 coax
matching section 50 ohms but this doesnt solve the problem either as the
VSWR doesnt change much with the extra coax section.
I did cut the section properly as the velocity factor for the coax is .78%
which gave me 26.825 ft.
Not sure what I am doing wrong or assuming - but looks like I could
use some input.
Try a half wavelength of coax.
ac6xg
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